Publisher's blurb:
Based on Kingmaker rules, Book of the River Nations: Mass Combat presents rules for the character's nation to rise against another nation with a simple and fun system. Perfect for players in any Pathfinder game that uses mass combat rules and an ideal reference for game masters to have a handy reference. With errata incorporated and frequently asked questions clarified, this book is the goto reference for mass combat. Now everyone at your table can have the rules to valiantly lead their kobold army (or whatever race) into battle.
Book of the River Nations: Mass Combat also features new tactics, requirements to produce certain types of units, rules for training time, the incorporation of the Leadership feat into mass combat and more.